Lockstitch shoe sewing machine



April 2l, 1936. o. R. HAAs LOCKSTITCH' SHOE SEWING MACHINE 2 Shets-SheetOriginal Filed Jan. 14, 1933 TLUBTUP Witness O. R, HAAS LOCKSTITCH SHOESEWING MACHINE prl 2, 1936.

2 sheets-sheet 2 Original Filed Jan. 14, 1933 Inv @f7/E071 wf, @by 6,55%h Wzlmess Mf- WWW/9% Patented Apr. 21, 1936 UNITE STATES United ShoeMachinery Corporatiom Paterson, N. J., a corporation of New JerseyOriginal application January-14, 1933, Serial No. 651,803. Divided andthisapplication January 30, 193.5, Serial No. 4,032;y

3 Claims..

The present invention relates to lockstitch shoe sewing machines forconnecting the outsole with the welt, lasted upper and insole of aGoodyear welt shoe, said machine being of the same construction andoperation as that described in applicants pending application Serial No.651,803, i'lled'January. 14, 1933 of which the present application is adivision.

The object of the present invention is to improve the, construction,arrangement and mode of operation of certain of the thread manipulatingparts ofV outsole shoe sewing machines.

With the above and other objects in view, as will hereinafter appear, afeature of the present invention contemplates the provision in anoutsole shoe sewing machine of a new and improved thread measuringmechanism for accurately measuring and controlling the locking threadforming the seam of a shoe being operated upon.

This and other features of the invention, including certain novel andimproved constructions and arrangements of parts are hereinafterdescribed in the following detailed specification, and are moreparticularly pointed out in the appended claims.

In the drawings, Fig. 1 is a view in side elevation partly in sectionand partly broken away of the sewing mechanism looking from the lefthand side of a machine embodying the features of the present invention;Fig. 2 is a plan view partly broken away and in section of the frontpart of the machine; and Fig. 3 is a view in front elevation, partlybroken away, of the same parts of the machine.

The sewing mechanism of the machine embodying the present invention issubstantially the same except as hereinafter described, as in themachine of applicants co-pending application Serial No. 600,016, ledMarch 19, 1932, for Shoe sewing machines. The illustrated machine isoperated from a sewing cam shaft I to actuate the stitch-forming andwork feeding devices of the machine including a curved hook needle I2, acurved awl I4, a looper I6, a shuttle or rotary loop taker I8, a threadfinger 20, a needle guide 22, a work support 24, a presser foot 26 and afeed slide 28 on which certain of the stitchforming devices are carried.The stitch-forming devices operate with a continuous feeding movement toform a lockstitch seam and, at the end of the operation, a stoppingmechanism is arranged to bring the sewing mechanism to rest at a denitepoint with the needle and awl disengaged from the Work. To rotate theloop taker during sewing, there are provided driving connectionsv oftheusual form between it and the sewingV shaft, the supply of lockingthread being contained in a thread case 29 carried by the looptaker (seeFig. 3).

The thread extending between the shuttle and the. work is manipulated atthe proper time to draw off and measure thread, as illustrated in Figure3, from the shuttle in a sufficient amount to form the succeedingstitch. This operation isperformed .by a rotary thread measuring member30s-having ngers for grasping the thread. As.. described moreparticularly in application Serial No. 600,016, referred to, the threadmeasuring member is mounted at the outer end of an inclined shaft 32rotated by an elongated pinion 34 secured to the inner end of the shaft.The pinion 34 meshes with a rack 36 sliding in a guideway 38, and therack is reciprocated by a cam 40 on the sewing cam shaft throughconnections comprising a link 42 (see Figure 1) connected at one endwith a lever 44 fulcrumed on the machine at 46 having a gear segment 48meshing with a corresponding segment 50 formed on a cam actuated arm 52.The other end of the link 42 is connected to the rack 36.

The thread measuring member 30 is also moved toward and from a positionwhere it may graspl and measure thread so as not to interfere with theoperation of the other stitch forming devices, and also according to thepresent invention may be moved slightly after grasping the thread tomove it to one side of the needle and awl before releasing it. Thesemovements are produced by reciprocating the shaft 32 longitudinally by aseparately actuated bifurcated lever 54 embracing the grooved end of theshaft 32 and having pins 56 extending into the groove. 'Ihe lever 54is-fulcrumed by a screw 58 threaded into the lever and passing looselythrough a lug in the frame of the machine, and is operated by a gearsegment 60 (Figure 3) meshing with teeth 62 formed on the hub of thelever 54. 'Ihe segment 60 is sup-ported by a screw 64 passing looselythrough a lug in the machine frame and engaging at its threaded end thesegment 60. The segment 60 is operated from the sewing cam shaft by anarm 66 extending upwardly from the segment 60, and having a cam followerat its end engaging a cam on the cam shaft. The movement of the threadmeasuring member 30 toward and away from a position where it may graspthe thread is, therefore, independent of its rotating movement and thethread, after being measured, may be retracted slightly as shown in Fig.3 to escape the needle as it moves into the work.

The nature and scope of the invention having been indicated and aspecific embodiment illustrating the several features of the inventionhaving been described, what is claimed is: v

1. A lockstitch sewing machine having, in combination, stitch-formingdevices including a locking thread case, a rotary loop taker for passinga loop' of thread about the thread case, a rotary locking threadmeasuring member arranged to engage the thread between the thread caseand the work and to draw thread from the thread oase, means for rotatingthe thread measuring member to measure thread, and means separate fromthe rotating means for shifting the thread measuring member toward andfrom a position where it may engage the thread when the thread measuringmember is rotated by said rotating means.

2. A lockstitch sewing machine having, in combination, stitch-formingdevices including a locking thread case, a rotary loop taker for passinga loop of thread about the thread case, a rotary thread measuring memberarranged to engage the thread between the thread case andA the Work andto draw thread from the thread case, a sewing cam shaft for thestitch-forming devices, connections between the cam shaft and the threadmeasuring member for rotating the measuring member to measure thread,and additional connections between the cam shaft and the measuringmember for shifting the thread measuring member toward and from aposition where it may engage the thread when the measuring member isactuated by the rotating connections.

3. A lookstitch sewing machine having, in combination, stitch-formingdevices including a locking thread case, a rotary loop taker for passinga loop of thread about the thread case, a rotary thread measuring memberarranged to engage the thread between the thread case and the work andto draw thread from the thread case, a sew ing cam shaft for thestitch-forming devices, connections between the cam shaft and the threadmeasuring member for rotating the measuring member to measure thread,and additional connections between the cam shaft and the measuringmember for shifting the thread measuring member toward and from aposition where it may engage the thread when the measuring member isactuated by the rotating connections, said connections being operated bythe cam shaft in proper timed relation to shift the thread measuringmember into a position where it mayv engage the thread, then to rotatethe measuring member to withdraw a supply of thread from the threadcase, and thereafter, before releasing the thread, to shift themeasuring member out of the position to Which it iirst was moved, andthereby prevent interference of the measured thread with the otherstitch-forming devices.

OTTO R. HAAS.

